Cryptography Is there an encryption method for which the encrypted file is indistinguishable from noise? |
- Is there an encryption method for which the encrypted file is indistinguishable from noise?
- EverCrypt cryptographic provider offers developers greater security assurances
- Generic Algorithm for Group Element Inversion
- Lambda - non negligible/ negligible functions
- Decryption of RSA PKCS1_OAEP error in PyCrypto python 3.7
- Encrypt/Decrypt messages through emojis, images and youtube video links on android and how is it done?
- Is a polymorhpic-virus a kind of homomorphic-crypto, and if so could we discover better ways to homomorphic encrypt things other than viruses by studying those viruses?
| Is there an encryption method for which the encrypted file is indistinguishable from noise? Posted: 30 Apr 2019 03:24 PM PDT Edit: Thanks for the answers, I was, indeed, asking about the ciphertext. Also, context, if it might spark more interesting discussion: Last year I made a steganography program for lolz and now I ended up submitting it for a project for school cause I was too lazy to make a new thing, and I have to write a documentation for it that has to include a section about how the program could be improved. I speculated that a potential attack to see weather or not there was data in a photo, would be to take the least significant bits, and see how "random" they are, and if you actually extract the file that I put in there, it may be less random than what the camera would normally give. I was going to write that the file could be encrypted to protect against this, but I wanted to make sure I wasn't talking crap. [link] [comments]  |
| EverCrypt cryptographic provider offers developers greater security assurances Posted: 30 Apr 2019 04:31 AM PDT |
| Generic Algorithm for Group Element Inversion Posted: 30 Apr 2019 10:59 AM PDT Hello, In a cryptography course today, we showed that the computational diffie-hellman problem is random self-reducible, for a generic group. To show that we create a reduction, and in the process assumed that we can efficiently invert a group element. Is this assumption valid? I don't know of any group that this assumption does not hold but also i can't think of a generic algorithm, that doesn't take into account any other structure that the group might have. I couldn't find anything by googling either. Are there any efficient generic algorithms to invert elements? Do groups exist, in which inversion is not efficient? I don't care if some trivial assumptions are needed, like for example the order of the group is known. [link] [comments]  |
| Lambda - non negligible/ negligible functions Posted: 30 Apr 2019 11:11 AM PDT Hey guys, First off I am very new to the world of crypto, but I find it quite interesting and decided I may aswell learn new concepts/skills, Firstly I would like to apologize if this is in the wrong section( also sorry if it's the wrong format ), this is my first time posting. If so could you please link me to where I could post a question,so here comes the question, I am following the crypto course on coursera provided by prof Dan Boneh, so far I have covered discrete probability, the viginere cipher, the one time pad and what it means to have a secure cipher, now I am studying stream ciphers and PRGs but there is a few things I cannot wrap my head around. So obviously a stream cipher has to be as unpredictable as possible having close to 1/2 probability of guessing the next nth bit given n-1.... bits, I am following this video @15:43 in the video what is meant by epsilon: Z >0 -> R>0 ?? why is epsilon considered a function? and what i also meant by this? when I think of functions I think of programming sub-routines or methods and this leads me into the most important question what is meant by ϵ (λ) = 1/2^λ = negligible and ϵ (λ)=1/λ^1000 = non-negligible. starting @ 16:13 again I am new to most of the math and crypto notation so if anybody could try explain in as laymens terms as possible that would be greatly appreciated. thanks [link] [comments]  |
| Decryption of RSA PKCS1_OAEP error in PyCrypto python 3.7 Posted: 30 Apr 2019 06:27 AM PDT I get this error everytime: raise ValueError("Incorrect decryption.") ValueError: Incorrect decryption. or raise ValueError("Ciphertext with incorrect length.") ValueError: Ciphertext with incorrect length. Please help if anyone knows about this! Thanks in advance. [link] [comments]  |
| Posted: 30 Apr 2019 07:33 AM PDT I have a basic idea about how this works in theory, but are there apps on android that can encrypt messages in emojis, images and youtube video links, so that they can be shared on social media without raising suspicion? I don't ask this to use it myself, but I'm dealing with a personal tragedy in my family and want to know if they were using this method for any reason. Any help would be appreciated/ [link] [comments]  |
| Posted: 30 Apr 2019 07:54 AM PDT https://en.wikipedia.org/wiki/Polymorphic_code
https://en.wikipedia.org/wiki/Homomorphic_encryption
[link] [comments]  |
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